Mainau is an island in the middle of beautiful Lake Constance, SouthWest Germany that one can reach by ferry. It is maintained as a garden island and a model of excellent environmental practices. The island belongs to the Lennart Bernadotte-Foundation), created by Prince Lennart, Count Bernadotte of Wisborg and formerly a prince of Sweden and a Duke. There are beautiful gardens, landscaping, a castle and a greenhouse with tropical climate and thousands of butterflies!